Published: Jan. 1, 2025
Language: Английский
Nature, Journal Year: 2023, Volume and Issue: 614(7948), P. 425 - 435
Published: Feb. 15, 2023
Language: Английский
Citations
133
Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)
Published: Sept. 2, 2022
Seasonal biases (the warm-season contribution) of Holocene mean annual temperature (MAT) reconstructions from geological records were proposed as a possible cause the mismatch with climate simulated temperature. Here we analyze terrestrial mollusk assemblages that best reflect seasonal signals and provide quantitative MAT four-season for northern China during past 20,000 years. The estimated temperatures four-season-mean based on mollusks shows peak ~9000-4000 years ago, followed by cooling trend. In general, contribution summer winter to is significantly greater than spring autumn temperatures. relative each season varies over time corresponds roughly insolation in season. This independent evidence mid-latitudes East Asia does not support long-term warming trend observed simulations bias explanation.
Language: Английский
Citations
79
Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)
Published: Oct. 3, 2022
Abstract Inconsistencies between Holocene climate reconstructions and numerical model simulations question the robustness of models proxy temperature records. Climate suggest an early-middle Thermal Maximum (HTM) followed by gradual cooling, whereas indicate continuous warming. This discrepancy either implies seasonal biases in proxy-based reconstructions, or that sensitivity to forcings feedbacks needs be reevaluated. Here, we analyze a global database paleotemperature records investigate spatiotemporal structure HTM. Continental at mid high latitudes Northern Hemisphere portray “classic” HTM (8–4 ka). In contrast, marine from same reveal earlier (11–7ka), while clear anomaly is missing tropics. The results heterogeneous response forcing highlight lack globally synchronous
Language: Английский
Citations
74
Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)
Published: Feb. 19, 2024
Abstract The Holocene temperature conundrum, the discrepancy between proxy-based global cooling and simulated annual warming trends, remains controversial. Meanwhile, reconstructions simulations show inconsistent spatial patterns of terrestrial changes. Here we report alkenone records to address over mid-latitude Eurasia. In contrast with long-term trends in warm season temperatures northeastern China, from southwestern Siberia are characterized by colder conditions before ~6,000 years ago, thus trends. Together existing surrounding regions, infer that airmass might have prevailed interior Eurasian continent during early mid-Holocene, perhaps associated atmospheric response remnant ice sheets. Our results challenge proposed seasonality bias proxies modeled study region, highlighting changes should be re-considered record integrations model simulations, important implications for hydroclimate
Language: Английский
Citations
15
Science Bulletin, Journal Year: 2024, Volume and Issue: 69(15), P. 2420 - 2429
Published: April 7, 2024
The term "Holocene temperature conundrum" refers to the inconsistencies between proxy-based reconstructions and transient model simulations, it challenges our understanding of global evolution during Holocene. Climate indicate a cooling trend following Holocene Thermal Maximum, while simulations consistent warming due ice-sheet retreat rising greenhouse gas concentrations. Various factors, such as seasonal biases overlooked feedback processes, have been proposed potential causes for this discrepancy. In study, we examined impact vegetation-climate on anomaly patterns in East Asia mid-Holocene (∼6 ka). By utilizing fully coupled Earth system EC-Earth performing with without dynamic vegetation, objective was isolate influence vegetation changes regional patterns. Our findings reveal that contributed across most Asia, resulting spatially diverse significantly improved model-data agreement. These results highlight crucial role addressing conundrum emphasize its importance simulating accurate climate scenarios.
Language: Английский
Citations
10
Communications Earth & Environment, Journal Year: 2024, Volume and Issue: 5(1)
Published: May 8, 2024
Abstract Understanding climate variability across interannual to centennial timescales is critical, as it encompasses the natural range of fluctuations that early human agricultural societies had adapt to. Deviations from long-term mean are often associated with both societal collapse and periods prosperity expansion. Here, we show contrary what global paleoproxy reconstructions suggest, mid late-Holocene was not a period stability. We use mid- Earth System Model simulations, forced by state-of-the-art external forcing eleven long-lasting cold occurred in Northern Hemisphere during past 8000 years. These correlate enhanced volcanic activity, where clustering eruptions induced prolonged cooling effect through gradual ocean-sea ice feedback. findings challenge prevailing notion Holocene characterized stability, portrayed multi-proxy reconstructions. Instead, our simulations provide an improved representation amplitude timing temperature variations on sub-centennial timescales.
Language: Английский
Citations
10
Climate of the past, Journal Year: 2024, Volume and Issue: 20(4), P. 841 - 864
Published: April 8, 2024
Abstract. Millennial-scale climate variations during the last glacial period, such as Dansgaard–Oeschger (DO) cycles and Heinrich events, have been extensively studied using ice core marine proxy records. However, there is a limited understanding of magnitude these temperature fluctuations in continental regions, questions remain about seasonal signal events. This study presents 60 000-year-long reconstruction based on branched glycerol dialkyl tetraethers (brGDGTs) extracted from lake sediments Eifel Volcanic Field, Germany. brGDGTs are bacterial membrane-spanning lipids that known to strong relationship with temperature, making them suitable for reconstructions. We test several calibration models modern samples taken soils multiple maar lakes. find negative bias brGDGT-based estimates associated water depth anoxic conditions can be corrected by accounting brGDGT isomer only produced conditions. The correlates model spanning same time validating approach we selected. millennial-scale variability significantly dampened record, contrast other Northern Hemisphere records, stadials, temperatures actually increase. demonstrate apparent discrepancies explained unique response paleothermometer months above freezing (TMAF). Our data support view warm-season Europe varied minimally period abrupt events were defined colder, longer winters. continuous high-resolution provides important information used inform studies paleoecological change.
Language: Английский
Citations
9
Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(3)
Published: Jan. 31, 2025
Abstract Past North Atlantic abrupt cold events have the potential to provide insights into future climatic response slowdown of meridional overturning circulation (AMOC). This study explores spring temperature changes on southern Tibetan Plateau during 8.2 ka event through simulations forced by freshwater hosing. Simulation results reveal anomalous warming due hosing‐induced AMOC slowdown. was primary caused increase net solar flux and presence an warm anticyclone over Plateau. The enhanced resulted from decrease in snowfall, which led a reduction albedo. snowfall mainly reduced westerly moisture transport, resulting weakened lower‐level westerlies induced AMOC‐driven climate variabilities tropical Indian Ocean. vertical northerly shear southeastern Plateau, diabatic heating released Asian monsoon rainfall. rainfall increased cyclone Mastuno‐Gill Ocean amplified wave train propagating Atlantic, both were weakening is likely play important role recent ongoing amplification
Language: Английский
Citations
1
Communications Earth & Environment, Journal Year: 2025, Volume and Issue: 6(1)
Published: March 16, 2025
Language: Английский
Citations
1
Global and Planetary Change, Journal Year: 2023, Volume and Issue: 230, P. 104288 - 104288
Published: Oct. 29, 2023
Language: Английский
Citations
22